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POWER GENERATION AND TRANSMISSION
15
afterward remains constant for a reasonable increase of load, then EB will show the characteristic illustrated, which is about normal.
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"4000                                       5000                                       6000                                        ItiQQ'
Kate of Heat Generation Available for Absorption perHooirper Sq.Ft.H:eatfn8 S,urfaee-s»
FIG. 13.—Heat absorption by boilers.    (After Lucke.')
80   90   100   IIO   120   130   140   150   l6b   170   l8o   190   20O   2IO   220  2JO
Per Cent of Boilers Rated Capacity Developed FIG. 14.—Boiler efficiency-capacity diagram.    (Courtesy Babcock & Wilcox.)
Boiler Losses.—In the preceding table, page 14, item (4) for cases (2) and (3) is abnormally high. These losses are easily controlled. The largest and least controllable loss is that due to the sensible heat of the stack gases. If A =